Improvement in valve-cock



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THOMAS MMSDEN,y 0F .ALLEGHENY eiTY, AND HENRY M. DAVIsY or PITTSBURG, PENNSYLVANIA...

Letters Pateat'No. 92,748, dated July 2 0, 1869.

IMPROVEMENT IN' VALVE-COCK.

The Schedule referred to in these Letters-Patent and making part cf the same.

The stem passes through a centre-piece, c, which screws into the upperend of the shell b.

. On the inside ofthe shell,- and running lengthways To all whom it may concern:

Be it known that we, THOMAS RAMSDEN, of theci'ty of Allegheny', and HENRY M. DAVIS, of the city of Pittsburg, both in the county of Allegheny, and State of Pennsylvania, have invented a new and useful 1mprovement in Valve-Cocks 3 and we do hereby declare thefollowing to be a full, clear, and exact description thereof, reference being had to the accompanying draw-l ing, making a part of this specification, in which- Figure l is aside elevation of a valve-shell, with valve in place',

Figure 2 is a vertical longitudinal section of the valveshell, showing the ribs on the inside of the shell;

Figure 3 is avertie-al section of the valve;

Figure dis an elevation, partly inseetion, showing the arrangement of the several parts in the process of grinding the valve on its seat; and

Figure 5 is a side view of Ivalve and stem, showing the ribs on the sides of the valve.

Like letters of referenceindicate like parts in each.

Our invention relates to an improvement in valves for steam, water, or other similar pipes, in which a disk, of metal or 'other similar material, is seated in an `aperture through which the fluid passes, so that, the valve being raised from or lowered into its seat,

`the flow of water orsteam, as the case may be, is per-- mitted or stopped, at pleasure.

The nature of our invention consists- First, in constructing guiding-ribs on the inner sides of the shell, through which the valve operates, or o n the outer face of the valve-disk, by which the valve shall be guided into and from its seat in a direct line;

Second, -in such construction of devices, that the valve may be rotated freely 4. on its seat while being ground, and still be held centrally thereon;

Third, in combining a T-head onthe lower end of the valve-stem, wth'a correspondingly-shaped recess.

in the bottom of a cup-shaped valve, so that the valve may be caused to rotate in its seat by the revolutions of the valve-stem in grinding, and be seated in ordinary use without being rotated; and' Fourth, in making a projecting flange or rimon the upper edge of a cup-shaped disk-valve, so that the valve may be turned up against the centre-piece, and make therewith a steam-tight joint.

`'lo enable those skilled in the art to make and use om' invention, we willl proceed to describe its construction and manner of use.

. b represents an ordinary steam or water-pipe, having a circular valve-seat a.

b is the valve-shell, a'is the valve, made of any suitable material or known form, but preferably of a disk-form, cup-shaped on its upper side, and groundto tit the seat 1 1I is the stem, by which, and the hand-wheel f, the valve a is operated.

-in our invention.`

of it, we make ribs, e, and turn their outer faces to the radius of the valve a', so that the latter, as it is seated and unseated, or being ground on its seat, will always be in the axial line of the' shell b and seat a. This feature is of value, as byrit we save a considerable part of the, expense of boring out the entire inner face of the shell, provide for a uniform pressure on all sides of the valve, as well as guide the valve directly on to its seat, without losing any of the advantages appertaining to the ordinary loose disk-valve. But if so preferred, the guiding-ribs may be vmade onthe sides of the valve, as at e', iig. 5, and the valve-shell b be bored with a plain inner face, and such variation we include seated, bya screw-thread, s, on the stem d, which plays into a female screwlin the centre-piece c, but only far enough, so that by turning it down, the valve a will be forced down snugly on to its Jseat a. .The

centre-piece @through which the stem d operates, must be withdrawn from the shell b far enough, so

that when thevalve a is seated, the screw-thread s To secure this rewill be clear of the centre-piece c. sult, and still be able to use the centre-,piece as a stembarrel or guide, we cut a deep female screw in the outer end of the shell b', and a male 4screw of like .length o n the centre-piece c, as shown at s', iig. 4. Then, when the centre-piece c is unscrewed a short distance, asin iig. 4, it will still act as a stem-guide, and the screwthreads can be screwed below or outside of the centre,

piece, and be disengaged therefrom. The valve a'can then be rotated freely, and ground to its seat a. When ground, the stem el can be screwed up again into the centre-piece c, and the latter be' turned downto its place, as in fig. 1, and the valve be ready for use.

But in order still further'to facilitate the grinding of the valve,"I make 'a T, -n, ou the end of the stem d, f

The function in either case is the.

face of the lock-nut o.

The cavity between thelock-nut and the bottom of the cup-shaped valve a', is large enough so that the 'valve a have a corresponding form, the object being,

by the insertion of the head n inA the recess n', to be able to rotate the valve a' ou its seat a. As another feature of our invention, we make a raised rim or iange, m, on the upper edge of the cupshaped valve af, which rim projects above the upper This rim m we grind, so that when screwed up against the lower face of the centrepiece c, it will make a steam-tight joint therewith.

It is sometimes necessary to change or 'renew the packing in the top nut l, in which case it is, with the valves in ordinary. use, necessary to cut off steam entirely, By our improvement, we make a steam-tight joint below, and then repack the top nut Z without further trouble.

What we claim as our' invention, and desire to secure by Letters Patent, is

1. Guiding-ribs e, in any desirable number, on the sides of a loose disk-valve, or on the sides of that part ofthe valve-shell through which the valve plays, substantially as and for the purposes above set forth.

2. The arrangement of long screw-threads on the centre-piece, and in the valve-shell of a disk-valve, in connection with threads 011 the stem and in the centre-piece, so combined, that by a partial unscrewing of the centre-'piece out of the shell, the stem-thread may be screwed out of the centre-piece, and the valve be rotated freely, substantially as and for the purposes set forth.

3. A head, n, on the end of the valve-stem, in combination with a correspondingly-shaped recess in the bottom of the valve-cup, substantially as and for the purposes set forth.

4. A valve, a', attached, by a lock-nut, o, to a stem, d, havingv the lim m projecting above the upper face of the lock-nut o, and ground, so as to operate, in c onnection with the centre-piece, to form a steauvtight joint, substantially'in the manner and for the purposes set forth.

In testimony whereof, We, the said THOMAS RAMS- DEN and HENRY M. DAVIS, have hereunto set our hands.

THOMAS RAMSDEN. HENRY M. DAVIS.

Witnesses:

W. BAKEWELI.,v l ILO. WRENSHALL. 

